The northern region is forecast to be 1-2 degrees warmer than the previous day, with sunny conditions continuing before a weak cold air mass brings rain on October 21-22.
In the northeastern region, early-morning fog is possible in some areas, followed by sunshine during the day and isolated showers at night. Winds will be light, with minimum temperatures of 24-27 degrees Celsius, falling below 23 degrees in some mountainous areas. Maximum temperatures are expected to reach 31-34 degrees, locally exceeding 34 degrees.
In the northwestern region, early-morning fog is also possible in some places, with sunshine during the day and isolated showers at night. Light winds are forecast. Temperatures will range from 23-26 degrees overnight and in the early morning, dropping below 22 degrees in some areas. Daytime highs will reach 31-34 degrees, locally rising above 34 degrees.
Hanoi is forecast to remain sunny on October 19, with no rain expected at night. Winds will be light, temperatures will fall to 24-26 degrees overnight and daytime highs will reach 32-34 degrees.
These conditions are expected to persist across the north through October 20. On October 21-22, a weak cold air mass is forecast to bring scattered showers and thunderstorms, with heavy rain possible in isolated areas and a slight drop in temperatures.